"Crap. Anybody got anything?"
"Jimmy has a brainfuck to Objective-C transpiler"
"How about non-native controls with a language no one cares about?"
Flutter exists because some people (also internally at Google) enjoy writing their stuff in Dart, so they created this tool for themselves, which they released in public.
People shouldn't get upset nor should they feel threatened by alternatives to their preferred tools.
Although I think this gives Google too much credit of forethought. Most of these projects are as Eric Schmidt used to say "throw stuff against the wall and see if it sticks".